I have a tethered pod point supplied with the car in 2017. Permanently on with switch inside outside meter cupboard. Never turned off in 5 years and has always worked fine with a mix of charges some timed and some instant. I have always disconnected the cable from car first at destination chargers (slow) apart from one set of chargers at Monks cross in York where I disconnected from car as usual and cable was locked to charge point. Enquired at car park office and they said yeh you have to disconnect from charger first seems its not the first time they said it.